Examine source code of Google Centralized Search

{
  "manifest_version": 2,
  "name": "Google Centralized Search",
  "version": "1.0",
  "description": "This extension centralizes google search to provide better experience on ultra wide monitors",
  "content_scripts": [
    {
      "matches": [
        "*://www.google.com/search*"
      ],
      "css": [
        "content.css"
      ],
      "run_at": "document_start"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e9d505f-1a53-47c9-be24-7b87267a490e}"
    }
  }
}